I would like to play devil's advocate
From this article I read
Unlike the volatility seen around other cryptocurrencys in the past, we believe that Libras focus on creating a stable, low inflation currency backed by a reserve or real assets is a differentiator. Further, unlike other stablecoins, Libra will not be pegged to one currency but instead a basket of assets ranging from bank deposits to short-term government securities.
https://www.cnbc.com/2019/06/18/the-difference-between-bitcoin-and-facebooks-libra.htmlWill Libra Coin bring Down Bitcoin's dominance in the market, your thought?
Libra Coin could shift the dominance of bitcoin in the market. With more than 2 billion Facebook members worldwide, if only 20% of the members use or save $ 100 Libra Coin, then if I'm not mistaken, a $ 200 billion market cap will be created just for Libra Coin. This will make at least the dominance of altcoin like ethereum or top 5 will be displaced and it could be that the dominance of Bitcoin is displaced by Libra Coin